Consolidated Statements of Equity (USD $)	Total	Common Stock [Member]	Contingently Issuable Shares [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Accumulated Deficit [Member]
Balance at Dec. 31, 2012	$ 15,550,301	$ 25,821	$ 6	$ 34,534,805	$ (84,538)	$ (18,925,793)
Balance (in shares) at Dec. 31, 2012		25,820,738			13,526
Issuance of common stock in connection with exercise of warrants	2,280,773	1,013		2,279,760
Issuance of common stock in connection with exercise of warrants (in shares)		1,013,009
Issuance of common stock in connection with cashless exercise of warrants	(1)	3		(4)
Issuance of common stock in connection with cashless exercise of warrants (in shares)		3,024
Issuance of common stock in connection with exercise of options (in shares)	0
Issuance of restricted stock	0	944		(944)
Issuance of restricted stock (in shares)		944,464
Issuance of common stock in public offering	37,648,280	6,555		37,641,725
Issuance of common stock in public offering (in shares)		6,555,000
Compensation in respect of restricted stock and stock options granted to employees, directors and consultants	5,203,148			5,203,148
Surrender of common stock for tax withholding	(149,799)				(149,799)
Surrender of common stock for tax withholding (in shares)					27,783
Net loss	(20,478,210)					(20,478,210)
Balance at Dec. 31, 2013	40,054,492	34,336	6	79,658,490	(234,337)	(39,404,003)
Balance (in shares) at Dec. 31, 2013		34,336,235			41,309
Issuance of common stock in connection with exercise of warrants	3,556,624	1,561		3,555,063
Issuance of common stock in connection with exercise of warrants (in shares)		1,560,826
Issuance of common stock in connection with exercise of options	202,400	46		202,354
Issuance of common stock in connection with exercise of options (in shares)	46,000	46,000
Issuance of restricted stock	0	983		(983)
Issuance of restricted stock (in shares)		982,793
Forfeiture of restricted stock	0	(1)		1
Forfeiture of restricted stock (in shares)		(1,000)
Issuance of common stock in public offering	16,791,408	2,703		16,788,705
Issuance of common stock in public offering (in shares)		2,702,809
Issuance of common stock in At the Market offering (net of offering costs of $1,101,572)	48,822,852	4,850		48,818,002
Issuance of common stock in At the Market offering (net of offering costs of $1,101,572) (in shares)		4,850,055
Compensation in respect of restricted stock and stock options granted to employees, directors and consultants	21,105,292			21,105,292
Common stock issued in connection with in-licensing agreements	5,350,093	496		5,349,597
Common stock issued in connection with in-licensing agreements (in shares)		496,530
Net loss	(55,781,277)					(55,781,277)
Balance at Dec. 31, 2014	$ 80,101,884	$ 44,974	$ 6	$ 175,476,521	$ (234,337)	$ (95,185,280)
Balance (in shares) at Dec. 31, 2014		44,974,248			41,309